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Process for deparaffinning a middle distillate feedstock using a catalyst based on izm-2 zeolite and an mfi-type zeolite

a technology of distillate feedstock and catalyst, which is applied in the direction of physical/chemical process catalyst, metal/metal-oxide/metal-hydroxide catalyst, hydrocarbon oil treatment product, etc., can solve the problem of reducing the yield of desired products, high pour point, and congealing for use at low temperature, so as to achieve the best possible yield of desired products and improve selectivity. , the effect of high activity

Active Publication Date: 2022-01-27
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention describes a process that converts a middle distillate feedstock with a high paraffin rating into a product with lower paraffin rating. The process uses a combination of at least one isomerizing zeolite and at least one cracking zeolite, which results in a synergistic effect that improves the selectivity and activity of the desired products. This results in better performance than existing processes. The combination of zeolites allows for selective cracking of n-paraffins while avoiding significant cracking of isoparaffins, which leads to the formation of the desired isomerate.

Problems solved by technology

Specifically, high molecular weight paraffins which are linear or very sparingly branched and which are present in middle distillates (diesel and kerosene) lead to high pour points and thus to congealing for uses at low temperature.
However, the cracking brought about in such processes leads to the formation of large amounts of products of lower molecular weights, such as butane, propane, ethane and methane, which considerably reduces the yield of desired products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

on of the Supports

[0098]ZSM-5 zeolite of MFI framework type code is a commercial solid (Zeolyst®) in NH4 form and with an Si / Al atomic ratio of 25.

[0099]The IZM-2 zeolite was synthesized in accordance with the teaching of patent application FR 2 918 050. The crude synthetic zeolite is subjected to calcination at 550° C. under a stream of dry air for 12 hours. After cationic exchange, the IZM-2 zeolite is in acidic form and has an Si / Al atomic ratio of 80.

[0100]In order to prepare the catalyst supports, the zeolites are kneaded with a boehmite binder (Sasol®, Pural SB3). The boehmite and zeolite powders are dry-blended before being introduced into the kneading tank. Kneading is performed in a closed tank with a solid lid on a double-arm Z-blade kneader (Guittard®) of MX type, with a rotation speed of 50 rpm. Water is gradually introduced to reach an LOI of between 40-50%. Passage into paste form takes place after 3 to 15 minutes. The kneaded paste is then extruded with a piston extru...

example 2

on of the Catalysts

[0101]Supports A to I in the form of extrudates obtained in example 1 are dry-impregnated with an impregnation solution prepared by hot dissolution of molybdenum oxide (MoO3, Alfa Aesar®, 99.5%) and nickel dihydroxide (Ni(OH)2, Alfa Aesar®, 61% metal basis) in aqueous phosphoric acid solution (H3PO4, Alfa Aesar®, 85% aqueous solution). After dry impregnation, the extrudates are left to mature under an atmosphere saturated with water for 2 hours, and are then dried for 12 hours at 120° C. and finally calcined under a stream of dry air at 450° C. for 2 hours. The amounts of molybdenum oxide, nickel dihydroxide and phosphoric acid are adjusted to obtain the following contents of molybdenum, nickel and phosphorus in oxide form on the catalysts. 2.0% by weight of NiO, 7.0% by weight of MoO3 and 2.5% by weight of P2O5. Catalysts A to I corresponding, respectively, to the supports A to I are thus obtained.

example 3

e Catalysts in a Process for Deparaffinning a Gas Oil

[0102]Catalysts A to I used for the deparaffinning of an atmospheric distillation gas oil which has undergone a hydrotreating step beforehand, the main features of which are given in table 2.

TABLE 2Characteristics of the hydrotreated atmospheric distillation gas oilSulfur content (ppm by weight)7.5Nitrogen content (ppm by weight)Pour point (° C.)0.0Density at 15° C. (g / mL)0.841Simulated distillationPoint at 0.5% by weight (° C.)135Point at 5% by weight (° C.)190Point at 25% by weight (° C.)257Point at 50% by weight (° C.)297Point at 70% by weight (° C.)325Point at 99.5% by weight (° C.)428WMT (weighted mean temperature—° C.)298

[0103]The deparaffinning process is performed in a fixed-bed reactor and with lost hydrogen (no recycling of the hydrogen).

[0104]The catalysts are sulfurized in situ in the reactor before the catalytic test. This sulfurization is performed in the presence of hydrogen with the sulfurization atmospheric distil...

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Abstract

The present invention relates to a process for deparaffinning a middle distillate feedstock, to convert, in good yield, feedstocks having high pour points into at least one cut having an improved pour point.Said process is performed with at least one catalyst comprising at least one hydro-dehydrogenating phase containing at least one metal from group VIB and at least one metal from group VIII of the Periodic Table of the Elements, and a support comprising at least one IZM-2 zeolite, a zeolite of WI framework type code and at least one binder.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a process for deparaffinning a middle distillate feedstock, to convert feedstocks having high pour points into at least one cut having an improved pour point, in good yield.[0002]Said process is performed with at least one catalyst comprising at least one hydro-dehydrogenating phase containing at least one metal from group VIB and at least one metal from group VIII of the Periodic Table of the Elements, and a support comprising at least one IZM-2 zeolite, at least one zeolite of MFI framework type code and a binder.PRIOR ART[0003]The treatment of petroleum fractions of middle distillate type, i.e. of a feedstock comprising at least 95% by weight of compounds with a boiling point of between 150 and 400° C. and preferably between 150 and 380° C., said feedstocks having high contents of linear or sparingly branched paraffins, is necessary in order to obtain high-quality products which will subsequently be used as diesel fuel ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01J23/883B01J29/80B01J29/78B01J35/10B01J8/02C10G49/04
CPCB01J23/883C10G2300/107B01J29/78B01J35/1019B01J35/1038B01J8/02C10G49/04B01J2229/42B01J2208/00017B01J2208/00539B01J2208/00548C10G2300/4006C10G2300/4012C10G2300/4018C10G2300/301C10G2300/70C10G2300/304C10G2300/202C10G2300/308B01J29/80C10G45/64C10G2300/1048C10G2300/1055C10G2400/04Y02P30/20B01J35/615B01J35/633
Inventor DIGNE, MATHIEUFECANT, ANTOINEBERTRAND-DRIRA, CHLOE
Owner INST FR DU PETROLE
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